package gof_002_结构型_Structural.gof_001_代理_Proxy.gof_001_StaticProxy;

public interface Singer {
    void connection();      //联系

    void bargain();         //讨价还价

    void payEarnestMoney(); //支付订金
    
    void sing();            //唱歌

    void payBalanceDue();   //支付尾款
}